Abstract: A sound generator includes at least one piezoelectric vibrator including a piezoelectric element, a vibration unit in one of a non-contact state not contacting the at least one piezoelectric vibrator and a contact state contacting the at least one piezoelectric vibrator. While in the contact state, the at least one piezoelectric vibrator generates vibration in response to a signal, and causes a contact surface contacted by the vibration unit to vibrate and generate a sound to be emitted from the contact surface. The sound generator can detect driving allowed and driving denied states, and control application of a sound signal in accordance with the two states to the piezoelectric element.

Abstract: A sound generator includes at least one piezoelectric vibrator including a piezoelectric element, a vibration unit in one of a non-contact state not contacting the at least one piezoelectric vibrator and a contact state contacting the at least one piezoelectric vibrator. While in the contact state, the at least one piezoelectric vibrator generates vibration in response to a signal, and causes a contact surface contacted by the vibration unit to vibrate and generate a sound to be emitted from the contact surface. The sound generator can detect driving allowed and driving denied states, and control application of a sound signal in accordance with the two states to the piezoelectric element.

Abstract: A sound generator includes a piezoelectric vibrator (60) including a piezoelectric element (61), an anchor applying a load to the piezoelectric vibrator (60), and a control unit (130) configured to control an input voltage based on a frequency characteristic, the input voltage being applied to the piezoelectric element (61) as a sound signal. While the load from the anchor is being applied to the piezoelectric vibrator (60), the piezoelectric vibrator (60) deforms in accordance with the input voltage applied to the piezoelectric element (61) from the control unit (130), and deformation of the piezoelectric vibrator (60) vibrates a contact surface (150) contacted by the sound generator, causing sound to be emitted from the contact surface (150).

Abstract: A sound generator includes a piezoelectric vibrator (60) including a piezoelectric element (61), an anchor applying a load to the piezoelectric vibrator (60), and a control unit (130) configured to control an input voltage based on a frequency characteristic, the input voltage being applied to the piezoelectric element (61) as a sound signal. While the load from the anchor is being applied to the piezoelectric vibrator (60), the piezoelectric vibrator (60) deforms in accordance with the input voltage applied to the piezoelectric element (61) from the control unit (130), and deformation of the piezoelectric vibrator (60) vibrates a contact surface (150) contacted by the sound generator, causing sound to be emitted from the contact surface (150).

Abstract: A mobile telephone which can perform communication by establishing a plurality of sessions includes: a hand over HO judgment portion which judges whether to perform a handover (HO); and an HO process portion which performs an HO processing. The HO processing portion includes: a priority decision portion which decides priority of a session to be subjected to an HO when a plurality of sessions are performing communication if the HO judgment result shows that the HO process is to be executed; and an HO execution portion which executes an HO of the session according to the decided priority. The HO processing portion further includes an HO reservation portion which reserves a connection request or a disconnection request occurred during the HO process.

Abstract: It is possible to provide a communication terminal, a handover process method, a communication system, and a program which can reduce a transmission delay accompanying a handover process in a mobile communication and perform a high-speed high-quality data communication. A mobile telephone (10) which can perform communication by establishing a plurality of sessions includes: an HO judgment unit (181) which judges whether to perform a handover (HO); and an HO process unit (182) which performs an HO process. The HO process unit (182) includes: a priority decision unit (1821) which decides priority of a session to be subjected to an HO when a plurality of sessions are performing communication if the HO judgment result shows that the HO process is to be executed; and an HO execution unit (1822) which executes an HO of the session according to the decided priority. The HO process unit (182) further includes an HO hold unit (1823) which holds a connection request or a disconnection request made during an HO process.